Detachable tread.



J. MITCHELL.

DETAGHABLB TRBAD.

APPLICATION FILED 119v. a, 1911.

1,066,3U5. PatentedJulyLlQlS.

flttorizey Specification of Letters ma.

Application filed November 3, 1911. Serial No. 658,890.

To all whom it ma concern.-

Be it known t at I, JOHN M1Tcrrn1.1.,'a subject of the King of Great Britaln and Ireland, and residingat Arthur street, Pon

sonby, Auckland, New Zealand, have invented certain new and useful Improvements in and Relating to Detachable Treads,

of which the following is a specification.

The invention relates to improvementsin detachable sole and heel tread-pieces interlocking with correspondingvmembers on the boots, shoes and the like footwear and although of wide applicability has special advantages, particularly as regards the renewal of soles, when applied to boots of a heavy class such as are used by laborers or for military, sporting or other purposes.

The primary object of the invention is the provision of a renewable sole or heel tread-piece which can be quickly detached or fixed in position without skilled assistance.

To this end the invention consists in the combinations of parts hereinafter described and particularly set forth in the appended claims.

Referring to the accompanying drawings which form-part of the specification: Figure 1 shows a perspective view of the underside of the heel of a boot according to one form of the invention. Fig. 2 shows in a corre sponding position a similar view of the renewable tread ready to be slid into place; Figs. 2 and 2 show forms of renewable studs for the tread ;.Fig. 3 shows the application of the invention to the heel of a lad s boot or shoe; Fig. 4 shows a view of the 1nvention applied to the sole of a boot or shoe, while Fig. 5 shows a side view of a form of hinged tongue.

. I wish it to be understood that the ings are to a certain extent of a diagrammatic nature and where desirable corresponding parts are denoted by the same reference symbols in different drawings.

In carrying the invention into effect according to one form as shown in Figs. 1 and 2, the body or base, a, of the heel of less than the normal depth has attached to it by nails or otherwise an overhung and interlocking support for the renewable tread portion, this overhung support comprising a draw cross strip of it may be leather, 6, and a projecting tongue, ,0, which may likewise be of leather, standing clear of the body of the heel except at that part at which it is attached theretoby way of the cross strip, 5. For a reason to be explained, it is preferable that the cross strip, 6, should not extend the full breadth of the projecting tongue, 0, so

that a recess or undercut portion is formed at each end of the strip. The parts described may be referred to as the permanent base structure. j

The renewable tread (Fig. 2) according to one form, is built up of a base or lift of leather, d, the. same size and shape as thebody of the heel, with a recess, e, corresponding to the cross strip, Z); since the recess,e, does not extend so far as the inner walls of the U or horse-shoe tread attached to the lift, (5, a projecting ledge or shelf, la, is left on each side.' This U or horse-shoe shaped tread may consist of a foundation of metal or of comparatively hard low grade rubber, h, or composition carrying buttons, 2', .of high grade rubber forming the tread proper. Instead of the buttons, 2', renewable studs ma be employed, illustrative examplesof w ich are shown in Figs. 2 and 2. According to the form shown in Fig. 2 the renewable stud, f, is formed with a flange, f, corresponding recesses being formed in the parts, 71. and d, of the renewable tread to receive the stud; while according to the form shown in Fig. 2 the stud, j, is of conical form and is inserted as shown in a hole of like shape in the tread body. Such a comparatively hard tread body renewable only at occasional intervals may thus outlast several sets of renewable studs.

The method of fixing the renewable tread in place will be understood from a consideration of Figs. 1 and 2. The tread is first slid into place from the rear end of the boot with a straight longitudinal motion, until the cross strip, 6, fits into the recess, a, and the projecting tongue, (2, simultaneously fits within the interior of the horse-shoe shaped tread. At the same time, the lateral ledges or shelves, in, of the base, d, fit into the corresponding recesses at the endsof the cross strip, 6, and so serve to strengthen and maintain in place the extreme ends of the Patented July 1 1913.

from the rear below the would be left free.

the heel and is partially locked to it by the superposed tongue, 0, and 11ft, d, so that 1t can only be withdrawn endwise; the fastening of the tread in place may then be completed by any suitable means such as the.

single screw, m, (the head of which preferably co-acts with a metal Washer, such as m, let into the tongue) passing throu h the projecting tongue, 0, and the base, into. the heel body, a.

,According to a modification of the mvention, (see Fig. 3) applicable to the heel of a ladys boot or shoe, the overhung support beneath which the tread is slid consists of a plate preferably of brass or other metal bent at right angles, the one arm n,'be1ng fixed to the more or less vertical ont wall of the heel by screws, 0 while the other arm, 0, corresponds precisely to the projecting tongue, 0, already described. The renewable tread as before may be formed of a base, d, of leather supporting a working ortion, it, having a central recess for about alf its depth, desi ed to receive the projecting arm, 0, an to leave the horseshoe shaped tread proper outstandin In this form of the invention as in t at previously described the renewable tread is slid into place projecting arm, a, so as to be partially locke to the heel body, the fastening being completed by the screw, m. The invention may also be applied to the soles of boots and shoes. Such an application will be understood in view of the above descriptiom by reference to Fi 4, the same reference letters being used as in Fi s. 1 and 2. The renewable tread which-may e curved either transversely or longitudinally to suit the sole bod is slid into place as before but in view 0 the l'en th of the overhung portion, a, it is genera y preferable in this case to men plurality of screws, m, to

fix the sole in position. 1

In order to relieve the buttons, 2', or the like forming the tread proper, studs, 77, such as those shown in Fi s. 2* and 2 or otherwise, may be arrange withinit-he U to pass through the"'tongue, 0.. Such studs can usually be brought mto place by slightly raising the tongue, 0, when sliding the tread into place but if desirable, the tongue may in some cases be hinged as indicated in Fig. 5.

form of heel shown in Fig. 3, the parts, 0

and n, beingin such a case hinged together instead of being bent at rightangles. In some cases the detachable and renewable portion may cover' a part only of the full areaof the sole or heel.-

Although I have described certain exam- ,ples of my invention by way of illustration, it will nevertheless be obvious that the principles 1' involved can be embodied in a variety of different structural forms.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. The combination in footwear of a per- 'manent base and a tread-piece detachable therefrom, the one such part comprisin' a lift and an attached U-member and the ot er such part comprising a body portion and an overhun ton ue secured thereto, said lift being dispose between said body portion and said tongue and said ton e fitting within the U-member and detacha le fasten l'ng means {pissing through said lift and said tongue to said tread-piece in place, as set forth,

2. The combination in footwear of a permanent base and a heel-piece etachable therefrom, the heel-piece comprising a lift and an attached U-member and the permanent base comprising a body portion and an overhun ton ue secured thereto, said lift being dispose between said body portion and said tongue and said tongue fitting within the U-member, and detachable fastening means passing through said liftand said tongue to fix said heel-piece in place, as set forth.

3. The combination in footwear of a baselationship one of" such members being overhung and the other passing beneath said,

overhung member, together with readily detachable means coactin with both said superposed members for asteningsaidtreadpiece in place as set forth,

5. The combination in footwear of .a permanent base and a tread-piece detachable therefrom, saidbase and tread piece respec- 5 detac tively including members in superposed relationship one of such members consisting in an overhung tongue pivotally mounted on said permanent base together with readily able means passing through said superposed members for fastening said treadplece in place, as set forth.

uni

In testimony whereof I have signed my I name. to this specification in the presence of two subscribing witnesses.

Witnesses:

BERTRAM H. MAmmws, W. H. BIRD,

JOHN MITCHELL; 

